Disk Device naming in sg/vm-Cluster

I'm facing a problem with two members of a sg/vm cluster. We are construct tow vmhost-members. Now we build on our EVA a Disk which we need build the vmos and to share between the two nodes. But on one node the disk appears as /dev/disk/disk21 on the other node as /dev/disk/disk15.Is this really a problem ?Should we and since where, renaming the disks ?